From an interview aired today on Good Morning America:
More at ABC News: Donald Trump for President? Trump Weighs in on Sheen, Palin, Obama...Speaking about the president, Trump – in line with "birthers" who question the president's citizenship – said he, too, had his doubts that Obama was born in the U.S."Everybody that even gives a hint of being a birther … even a little bit of a hint, like, gee, you know, maybe, just maybe this much of a chance, they label them as an idiot. Let me tell you, I'm a really smart guy," he said.He explained the source of his doubt: "He grew up and nobody knew him. You know? When you interview people, if ever I got the nomination, if I ever decide to run, you may go back and interview people from my kindergarten. They'll remember me. Nobody ever comes forward. Nobody knows who he his until later in his life. It's very strange. The whole thing is very strange," he added.